Patrick Shanahan

Citizens for Responsibility and Ethics in Washington filed the request alleging Shanahan violated rules by promoting Boeing.

President Donald Trump said via Twitter on Tuesday that Army Secretary Mark Esper will take over as acting Pentagon chief.

Army Secretary Mark Esper will become acting SecDef, President Donald Trump tweeted.

Two key House lawmakers slammed a Pentagon proposal that would limit what top brass tells Congress about operational plans.

Acting Defense Secretary Shanahan defended the Pentagon's move to carry out a joint show of force in the Persian Gulf.

The longest-serving acting defense secretary will be nominated to do the job permanently, White House officials announced.

The Defense Department continues to address concerns that firefighting foam is polluting groundwater.

A Pentagon sexual-assault task force has made a number of recommendations to curb the crime in the ranks.

Acting Defense Secretary Patrick Shanahan did not use his position to promote Boeing, the Pentagon's top watchdog said.

The task force will assess how the armed forces handle and prosecute sex crimes.